Add CodeQL analysis workflow for Go (Continuous SDL / S360)

.github/workflows/codeql.yml

@@ -0,0 +1,58 @@
+# CodeQL analysis for Continuous SDL / S360 compliance.
+# The Go code lives under plugins/ (module github.com/tensorworks/directx-device-plugins/plugins)
+# and is Windows-only (//go:build windows), so autobuild on ubuntu (GOOS=linux)
+# finds no packages. We use build-mode: manual and cross-compile with
+# GOOS=windows so CodeQL can trace the build and extract the Windows packages.
+name: "CodeQL"
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    - cron: "0 9 * * 1"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  analyze:
+    name: Analyze (go)
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+    strategy:
+      fail-fast: false
+      matrix:
+        language: ["go"]
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+
+      - name: Set up Go
+        uses: actions/setup-go@0a12ed9d6a96ab950c8f026ed9f722fe0da7ef32 # v5.0.2
+        with:
+          go-version-file: plugins/go.mod
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@4dd16135b69a43b6c8efb853346f8437d92d3c93 # v3.26.6
+        with:
+          languages: ${{ matrix.language }}
+          build-mode: manual
+
+      - name: Manual build (Windows target)
+        working-directory: plugins
+        env:
+          GOOS: windows
+          GOARCH: amd64
+        run: go build ./...
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@4dd16135b69a43b6c8efb853346f8437d92d3c93 # v3.26.6
+        with:
+          category: "/language:${{ matrix.language }}"